MKS Servo42C: wobbling movements or losing steps under high speed movements

Symptom

When moving in higher speed (eg. 200+ mm/s) using MKS Servo42C as XY driver, one of the symptoms below shows up:

• While doing bed tramming, the extruder was expected to move in a skew straight line but turns into two bent line segments. One of the XY steppers cannot keep up with the other.

• While moving in pure X direction, the XY joiner slightly wobbles in Y direction.

Solution

• The ACC was disabled in the display menu by default. Set both XY drivers to 538, or other values that fix your issue.